ST-MPA24 Dual Microphone Phantom Adapter

The microphone phantom adapter shall be an RDL ST-MPA24. The unit shall provide an adjustable phantom voltage to two separate condenser microphones. The unit shall block the phantom voltage from its output terminals.

The unit shall provide an audio frequency response of 15 Hz to 50 kHz (± 0.25 dB, 150 O source and load).

A multi-turn trimming control shall be provided to set the unloaded phantom voltage applied to both inputs.  With this control set fully clockwise, each microphone input is driven by 24 Vdc phantom voltage conformant to IEC 61938: 2013.  The control may be turned counterclockwise to reduce the dc phantom voltage down to 0 Vdc.

Ripple from the power supply shall be attenuated a minimum of 70 dB.

The unit shall be constructed in an electrically non-conductive, thermally conductive enclosure. Internal circuitry shall be protected from moisture and vibration using a thermally conductive compound that permanently secures the circuitry within the enclosure.

The face of the unit shall provide graphical labels identifying wiring connections and operating controls. Controls shall be oriented toward the face of the unit.  The unit shall include the IEC conformant P24 front-panel labeling.

Connection to external wiring shall be provided using a fixed terminal block on the edge of the unit. The terminal block shall accept wiring gauges from 14 to 22 and shall include a positive electrically conductive mechanism to prevent wire abrasion by the terminal screws.

The unit shall measure 3” (7.6 cm) x 1.6” (4 cm) x 0.7” (1.7 cm) and be compatible with all RDL STICK-ON mounting accessories. The unit shall be supplied with a two part re-closable polypropylene fastener system equipped with a rubber adhesive that bonds to low surface energy materials.

Power requirements shall be 24 Vdc ground-referenced with a maximum current not exceeding 30 mA. The unit shall utilize an external power supply. The unit shall be engineered, assembled and tested in the U.S.A. and be specified for continuous duty in professional installed systems. The unit shall be specified for operation in an ambient temperature between -10 and 55 degrees C. The unit shall comply with relevant EMC requirements and shall bear the CE marking.

The unit shall be an RDL ST-MPA24.